The knowledge of the use of the mind to create and levitate stone etc. was perfected in some highly advanced civilizations. And was carried to Egypt and other places by survivors after the destruction of Atlantis. The ETs were still living among men and sharing advanced knowledge during the time of Atlantis. It began with the basic tracking of the seasons, then later developed into the more sophisticated system of astronomy. This was done so the ETs could keep track of their own home planet and its position. The structures could also be seen from space and served as markers for spaceships
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